我最近一直在寻找一个好的 PDF 教程、文档等。
我最终使用了这段代码，但几乎没有问题。
设想
我有一个包含标签、textView 和 imageView 的视图。现在，我们将调用 label name、 textViewdescription和 imageView image。
该名称用作标题。
描述非常非常可变，可以从 2 行到某些页面。
图片应该放在描述文本的末尾。
我正在使用这段代码：
- (void)generatePDF{
NSString *fileName = [NSString stringWithFormat:@"%@.pdf",nameString];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *pdfFileName = [documentsDirectory stringByAppendingPathComponent:fileName];
CFAttributedStringRef currentText = CFAttributedStringCreate(NULL,
(CFStringRef)descriptionString, NULL);
if (currentText) {
CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString(currentText);
if (framesetter) {
// Create the PDF context using the default page: currently constants at the size
// of 612 x 792.
UIGraphicsBeginPDFContextToFile(pdfFileName, CGRectZero, nil);
CFRange currentRange = CFRangeMake(0, 0);
NSInteger currentPage = 0;
BOOL done = NO;
do {
// Mark the beginning of a new page.
UIGraphicsBeginPDFPageWithInfo(CGRectMake(0, 0, kDefaultPageWidth,
kDefaultPageHeight), nil);
[self drawHeader]
// Draw a page number at the bottom of each page
currentPage++;
[self drawPageNumber:currentPage];
// Render the current page and update the current range to
// point to the beginning of the next page.
currentRange = [self renderPage:currentPage withTextRange:
currentRange andFramesetter:framesetter];
// If we're at the end of the text, exit the loop.
if (currentRange.location == CFAttributedStringGetLength
((CFAttributedStringRef)currentText))
done = YES;
} while (!done);
// Close the PDF context and write the contents out.
UIGraphicsEndPDFContext();
// Release the framewetter.
CFRelease(framesetter);
} else {
NSLog(@"Could not create the framesetter needed to lay out the atrributed string.");
}
// Release the attributed string.
CFRelease(currentText);
} else {
NSLog(@"Could not create the attributed string for the framesetter");
}
}
- (CFRange)renderPage:(NSInteger)pageNum withTextRange:(CFRange)currentRange
andFramesetter:(CTFramesetterRef)framesetter
{
// Get the graphics context.
CGContextRef currentContext = UIGraphicsGetCurrentContext();
// Put the text matrix into a known state. This ensures
// that no old scaling factors are left in place.
CGContextSetTextMatrix(currentContext, CGAffineTransformIdentity);
// Create a path object to enclose the text. Use 72 point
// margins all around the text.
CGRect frameRect = CGRectMake(22,72, 468, 648);
CGMutablePathRef framePath = CGPathCreateMutable();
CGPathAddRect(framePath, NULL, frameRect);
// Get the frame that will do the rendering.
// The currentRange variable specifies only the starting point. The framesetter
// lays out as much text as will fit into the frame.
CTFrameRef frameRef = CTFramesetterCreateFrame(framesetter, currentRange, framePath, NULL);
CGPathRelease(framePath);
// Core Text draws from the bottom-left corner up, so flip
// the current transform prior to drawing.
CGContextTranslateCTM(currentContext, 0, kDefaultPageHeight);
CGContextScaleCTM(currentContext, 1.0, -1.0);
// Draw the frame.
CTFrameDraw(frameRef, currentContext);
// Update the current range based on what was drawn.
currentRange = CTFrameGetVisibleStringRange(frameRef);
currentRange.location += currentRange.length;
currentRange.length = 0;
CFRelease(frameRef);
return currentRange;
}
- (void)drawPageNumber:(NSInteger)pageNum
{
NSString* pageString = [NSString stringWithFormat:NSLocalizedString(@"Page", nil), pageNum];
UIFont* theFont = [UIFont systemFontOfSize:12];
CGSize maxSize = CGSizeMake(kDefaultPageWidth, 72);
CGSize pageStringSize = [pageString sizeWithFont:theFont
constrainedToSize:maxSize
lineBreakMode:UILineBreakModeClip];
CGRect stringRect = CGRectMake(((kDefaultPageWidth - pageStringSize.width) / 2.0),
720.0 + ((72.0 - pageStringSize.height) / 2.0) ,
pageStringSize.width,
pageStringSize.height);
[pageString drawInRect:stringRect withFont:theFont];
}
我想知道如何在页面末尾绘制图像，就在描述结束之后。
我以这种方式绘制了标题：
-(void)drawHeader{
NSString *headerString = nameString;
UIFont* theFont = [UIFont boldSystemFontOfSize:15];
CGSize maxSize = CGSizeMake(kDefaultPageWidth, 72);
CGSize pageStringSize = [headerString sizeWithFont:theFont constrainedToSize:maxSize lineBreakMode:UILineBreakModeClip];
CGRect stringRect = CGRectMake(22,22,pageStringSize.width,pageStringSize.height);
[headerString drawInRect:stringRect withFont:theFont];
}
它显示在每一页的开头。
现在我不知道如何在内容（描述）之后绘制图像！